Truss



April 23, 1929.- H. J. A'SLES'ON 1,710,031

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Filed Feb. 27. 1928 UNITED s rAiEs PATENT OFFICE.

HANS J. ASLESON, OF MINNEAPOLIS, MINNESOTA.

TRUSS.

Application filed February 27, 1928. Serial No. 257,204.

My invention relates to struetu ".11 steel trusses, such as girders, roof-supporting rafters, bridge spans and the like, and provides a highly important feature whereby the efficiency of the truss is materially in, creased.

The invention is illustrated in the accom panying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawinm' Fig. l is a diagrammatic side elevation showing the truss designed as a single span;

Fig. 2 is a fragmentary sideeievation of a portion of the truss;

Fig. 3 is a view partly in vertical section on the line 33 of Fig. 2, but With some parts in full; and I Fig. l is a horizontal section taken on the line 4-4 of Fig. 2.

In the truss illustrated, the arched top compression member 5 is formed by two angle bars having their depending flanges spaced in parallel relation. The bottom tension member 6 may be assumed to be made, in a similar manner, of straight angle bars having spaced parallel vertical flanges. The struts'l,

in this illustrated truss, are made up of pairs of straight vert1eally disposed angle irons having their parallel flanges placed against the vertical flanges of the members 5 and 6. The oblique members 8 are flat bars, certain of which are placed in obliquely crossed arrangement and with their joining ends overlapped and with a bolt 9 passed through coincident bolt holes formed in themembcrs 5, 6, 7 and 8. The bolts 9 are shown as provided with nuts 10. The trussed structure so far described would be ordinary truss structure, except that interior gusset plates would be required.

As the salient feature of this invention, the contacting lapped ends oi? the oblique membolt 9 is subjected not only to shearing strain at three points, but also to a bending strain in the plane of the contacting surfaces of the overlapped ends of said members 8, and which plane is midway between the opposing faces of the vertical flanges of the members 5-5 and (S -6. Obviously, with the overlapped ends of the members 8 welded together so that the one member 8 cannot slip in respect to the other, the two overlapped and integrally united ends act as a single member, thereby entirely eliminating bending stress at the center of the bolt and con verting the load-resisting force entirely into shearing strain directly between, the outer faces of the members 8 and the inner faces of the vertical flanges of said members 5--5 and 66. Stated in another way, the bearing value of the pin is increased from the bearing value on the thickness oi. the one bar to the bearing value on the combined thickness oi the two bars that are welded together, and which is greater than the double shear on the pin. vlly thus making the limiting value of the counccti on the value of the pin in double shear, the necessityv for interior gusset plates iseliminated by the substitution of a onebolt connection. This accomplishes a saving, both in shop labor and in metal, to such an extent that the average structural steel truss may compare favorably in price with a wooden truss. The values of the steel trusses over wooden trusses, by way of durability, reduced lire hazard and general. appearance, are well known.

While I have, in the drawing, illustrated a specific form. of truss, it is, of course, obvious that the invention herein disclosed is capable oi? incorporation to a greater or less extent in various diilerent designs and forms of trusses, all within the scope of the im'ention as l'iercin disclosed and claimed.

What I claim in: 1. In a truss, a main truss member comprising laterally spaced bars, oblique truss Q Lei seated 'ainst the bars oi said main members,

oblique truss ineinbeis having overlapped and integrally unite-cl ends increasing the thickness of the lapped portion to that of the aggregate Width of the two lapped members interposed between the spaced bars of said nisin truss member, and bolt passed threngli "be spaced bars of said main and end sirut members and tlireugh the integrally united ends of said lapped members.

in testnneny Wliereei' I my slgnature.

HANS J, ASLESON. 

